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Dominance hierarchies and associated signalling in a cooperative passerine

Show simple item record Rat, M Van Dijk, RE Covas, R Doutrelant, C 2018-05-14T08:51:52Z 2018-05-14T08:51:52Z 2014-12-16 2014-12-16
dc.identifier.citation Rat, M, van Dijk, RE, Covas, R & Doutrelant, C 2014,’ Dominance hierarchies and associated signalling in a cooperative passerine’, Behavioral Ecology and Sociobiology, Vol. 69, pp. 437-448, Viewed 14 May 2018, Springer Verlag, DOI 10.1007/s00265-014-1856-y en_US
dc.identifier.issn 0340-5443
dc.description.abstract In animal societies, individuals face the dilemma of whether to cooperate or to compete over a shared resource. Two intertwined mechanisms may help to resolve this enduring evolutionary dilemma by preventing conflicts and thereby mediating the costs of living in groups: the establishment of dominance hierarchies and the use of ‘badge-of-status’ for signalling dominance. We investigated these two mechanisms in the sociable weaver (Philetairus socius), a colonial and social passerine which cooperates over multiple tasks. We examined the sociable weavers’ dominance structure in 2 years by recording 2563 agonistic interactions between 152 individuals observed at a feeder at eight colonies. We tested which individual traits, including sex, age, relatedness and two melanin-based plumage traits, predicted variation in social status. First, using social network analysis, we found that colonies were structured by strongly ordered hierarchies which were stable between years. Second, medium-ranked birds engaged more in aggressive interactions than highly ranking individuals, suggesting that competition over food is most pronounced among birds of intermediate social status. Third, we found that colony size and kinship influenced agonistic interactions, so aggression was less pronounced in smaller colonies and among relatives. Finally, within- and between-individual variation in social status and the presence of an individual at the feeder were associated with variation in bib size, as predicted by the badge-of-status hypothesis. These results suggest that dominance hierarchies and bib size mediate conflicts in sociable weaver societies. en_US
dc.description.sponsorship National Research Foundation (South Africa) en_US
dc.format.extent Tables: ii, fig.: v, 12 p. en_US
dc.format.medium PDF en_US
dc.language.iso en en_US
dc.publisher Springer Verlag en_US
dc.rights Attribution-NonCommercial-NoDerivs 3.0 United States en_US
dc.rights.uri en_US
dc.subject Dominance en_US
dc.subject Cooperation en_US
dc.subject Social status en_US
dc.subject Badge of status en_US
dc.subject Conflict en_US
dc.subject Melanin en_US
dc.title Dominance hierarchies and associated signalling in a cooperative passerine en_US
dc.type Article en_US
dc.rights.holder Springer Verlag en_US

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